JP7377939B2 - Display system and display method - Google Patents

Description

The present invention relates to a display system and display method that display images using a plurality of display devices.

2. Description of the Related Art Display systems (also referred to as multi-display systems) that display images using a plurality of display devices (displays) arranged in rows and columns are conventionally known. In the display system, there is a technology for adjusting the scanning timing of each display device and the scanning direction of each display device so that there is no misalignment (image shift) between images displayed on each display device. Proposed.

For example, in Patent Document 1, a control PC that controls a multi-display system is configured to display a plurality of images arranged in multiple rows so that the top and bottom of the scanning direction of the scanning lines are switched every other row from one image (one frame). A technique is disclosed in which a plurality of divided images are generated to be displayed on each of the displays, and each display PC displays the generated plurality of divided images on each display. Furthermore, Patent Document 1 discloses that an image whose scanning direction is reversed (reverse scanned) is subjected to a process of rotating the image by 180 degrees.

Japanese Patent Application Publication No. 2013-117601

In the conventional technology, the control PC generates an image (divided image) to be displayed on each display from a video signal, and transmits the generated divided image to each display. Therefore, in the control PC, the amount of frame memory used increases and the circuit configuration becomes complicated.

An object of the present invention is to provide a display system that displays images using a plurality of display devices, which can prevent image shift between display devices with a simple circuit configuration while suppressing the amount of frame memory used. and to provide a display method.

In the display system according to one aspect of the present invention, a video signal corresponding to one frame is input to each of the plurality of display devices, and each of the plurality of display devices displays an image, thereby responding to the video signal. The display system displays one frame of image, wherein the plurality of display devices include a first display device and a second display device that are arranged adjacent to each other in a first direction in which a data signal line extends. The first display device includes a first signal processing unit that generates a first divided image that is a part of the image based on a video signal of a first transmission period among the video signals corresponding to the one frame. , a first display unit that displays the generated first divided image, and the second display device is configured to transmit a second transmission after the first transmission period of the video signal corresponding to the one frame. a second signal processing unit that generates a second divided image that is a part of the image based on a video signal of a period; and a second display unit that displays the generated second divided image, The first signal processing unit sets the scanning direction of the gate signal line arranged in the first display device to the first scanning direction, and the second signal processing unit sets the scanning direction of the gate signal line arranged in the second display device. The scanning direction of the image is set to a second scanning direction opposite to the first scanning direction, and the first signal processing unit further determines that the timing at which the first display device displays the first divided image is set to the second scanning direction opposite to the first scanning direction. The first delay time is set to match the timing at which the second display device displays the second divided image.

In a display method according to another aspect of the present invention, a video signal corresponding to one frame is input to each of a plurality of display devices, and each of the plurality of display devices displays an image to correspond to the video signal. The display method for displaying one frame of image, wherein the plurality of display devices include a first display device and a second display device that are arranged adjacent to each other in a first direction in which a data signal line extends. a first signal processing step in which the first display device generates a first divided image that is a part of the image based on a video signal of a first transmission period among the video signals corresponding to the one frame; , a first display step of displaying the generated first divided image, wherein the second display device displays a second transmission after the first transmission period of the video signal corresponding to the one frame. a second signal processing step of generating a second divided image that is a part of the image based on a video signal of a period; and a second display step of displaying the generated second divided image, In the first signal processing step, the scanning direction of the gate signal line arranged in the first display device is set to the first scanning direction, and in the second signal processing step, the scanning direction of the gate signal line arranged in the second display device is set to the first scanning direction. The scanning direction of the image is set to a second scanning direction opposite to the first scanning direction, and the first signal processing step further includes timing at which the first display device displays the first divided image. , the first delay time is set to match the timing at which the second display device displays the second divided image.

According to the present invention, in a display system that displays images using a plurality of display devices, it is possible to suppress the amount of frame memory used and prevent image misalignment between the display devices with a simple circuit configuration.

FIG. 1 is a diagram showing a schematic configuration of a display system according to an embodiment of the present invention. FIG. 2 is a diagram showing data signal lines and gate signal lines arranged in a display device according to an embodiment of the present invention. FIG. 3 is a diagram schematically showing the scanning direction in the display device according to the embodiment of the present invention. FIG. 4 is a block diagram showing a specific configuration of a display system according to an embodiment of the present invention. FIG. 5 is a flowchart for explaining an example of the procedure of delay time setting processing in the display device according to the embodiment of the present invention. FIG. 6 is a diagram showing an example of an image displayed in the display system according to the embodiment of the present invention. FIG. 7(a) is a diagram showing an example of an image displayed in a display system according to a comparative example, and FIG. 7(b) and FIG. 7(c) are diagrams showing an example of an image displayed in a display system according to an embodiment of the present invention. It is a figure showing an example of an image. FIG. 8 is a diagram schematically showing the flow of processing until an image is displayed on the display screen of the display system according to the embodiment of the present invention. FIG. 9 is a timing chart showing display timing in the display device according to the embodiment of the present invention. FIG. 10 is a diagram showing another configuration of the display system according to the embodiment of the present invention. FIG. 11 is a diagram showing another configuration of the display system according to the embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the following embodiment is an example embodying the present invention, and does not have the character of limiting the technical scope of the present invention.

FIG. 1 is a diagram showing a schematic configuration of a display system 100 according to an embodiment of the present invention.

The display system 100 includes a plurality of display devices 10 and a video output device 200. The plurality of display devices 10 are arranged side by side in the row and column directions. The plurality of display devices 10 are connected in a daisy chain in a loop so that the video signal Dv is transmitted from upstream to downstream (see FIG. 2). In FIG. 1, four display devices 10a, 10b, 10c, and 10d are shown as an example. The number of display devices 10 is not limited. Below, the display system 100 will be explained as being configured with four display devices 10a, 10b, 10c, and 10d.

When the display surface 110 of the display system 100 is a coordinate plane, the display device 10a is arranged at (row, column)=(1,1), and the display device 10b is arranged at (row, column)=(1,2). The display device 10c is arranged at (row, column)=(2,2), and the display device 10d is arranged at (row, column)=(2,1). FIG. 2 shows data signal lines DL (source lines) and gate signal lines GL (scanning signal lines) arranged in each of the display devices 10a, 10b, 10c, and 10d. Each of the display devices 10a, 10b, 10c, and 10d includes a plurality of data signal lines DL extending in a first direction (here, the column direction) and a plurality of data signal lines DL extending in the second direction (here, the row direction). A gate signal line GL is arranged. Each of the display devices 10a, 10b, 10c, and 10d includes a plurality of thin film transistors (TFTs), pixel electrodes, and a common electrode arranged near the intersections of each data signal line DL and each gate signal line GL. , a liquid crystal layer, etc. (none of which are shown).

The video output device 200 is configured by, for example, a personal computer, a television broadcast receiving device, an image reproducing device, or the like. The video output device 200 outputs an image to be displayed on the display surface 110 as a video signal Dv.

The display system 100 displays an image of each frame corresponding to the video signal Dv on a display surface 110 configured by the display units of four display devices 10a, 10b, 10c, and 10d. For example, when an image of one frame is divided into four areas (top, bottom, left, right), the display device 10a displays the upper left divided image in the upper left area (1, 1) of the display surface 110, and the display device 10b displays the upper left divided image in the upper left area (1, 1). The display device 10c displays the lower right divided image in the lower right region (2, 2) of the display surface 110, and the display device 10c displays the lower right divided image in the lower right region (2, 2) of the display surface 110. 10d displays the lower left divided image in the lower left area (2, 1) of the display surface 110. Each divided image may have the same resolution or different resolutions.

Furthermore, the display system 100 is capable of setting the scanning direction (scanning direction) of the gate signal line GL for each display device. FIG. 3 is a diagram schematically showing an example of the scanning direction of each of the display devices 10a, 10b, 10c, and 10d. In the example shown in FIG. 3, the display devices 10a and 10b are set in a forward direction from top to bottom, and the display devices 10c and 10d are set in a reverse direction from bottom to top.

Note that the upper (upper left and upper right) divided images (an example of the first divided image of the present invention) correspond to, for example, the video signal of the first transmission period (for example, the first half period) of the video signal Dv corresponding to one frame. The lower (lower left and lower right) divided images (an example of the second divided image of the present invention) are images of the second transmission after the first transmission period of the video signal Dv corresponding to the one frame. This is an image corresponding to a video signal of a period (for example, the second half period).

FIG. 4 is a block diagram showing a specific configuration of the display system 100 according to the embodiment of the present invention. The display devices 10a, 10b, 10c, and 10d are daisy-chained in a loop so that the video signal Dv is transmitted from upstream to downstream.

The display device 10a (an example of a first display device of the present invention) includes a signal processing section 11a (an example of a first signal processing section of the present invention), a frame memory 12a, a storage section 13a, a drive control section 14a, and a display section 15a. (an example of the first display section of the present invention). A video signal Dv output from the video output device 200 is input to the input terminal Tia of the display device 10a.

The video output device 200 transmits an image (frame image) to be displayed on the display devices 10a, 10b, 10c, and 10d to the display device 10a as a video signal Dv. In FIG. 4, the video output device 200 shows a video signal Dv corresponding to the image of the first frame F1. In FIG. 4, the symbols a to d attached to the image of the first frame F1 each indicate a part of the image (divided image). A divided image a indicates an image displayed on the display device 10a, a divided image b indicates an image displayed on the display device 10b, a divided image c indicates an image displayed on the display device 10c, and the divided image b indicates an image displayed on the display device 10c. d indicates an image displayed on the display device 10d.

The video signal Dv input from the video output device 200 to the display device 10a is input to the signal processing section 11a, and is also transferred to the output terminal Toa of the display device 10a.

The signal processing unit 11a stores the video signal Dv in the frame memory 12a. Specifically, the signal processing unit 11a sequentially transfers the video signal Dv received from the video output device 200 to the frame memory 12a. The frame memory 12a stores one frame worth of video signal Dv (input image data).

Further, the signal processing unit 11a performs various signal processing on the input image data. Specifically, the signal processing unit 11a cuts out data (divided image data) corresponding to the divided image a displayed by the display device 10a from the input image data of the frame memory 12a, and adds the following to the divided image data. Each signal processing is performed to generate image data Da.

For example, the signal processing unit 11a performs processing (image reversal processing) on the divided image data for reversing the vertical direction of the divided image a displayed by the display device 10a. Specifically, the signal processing unit 11a performs the image inversion when the scanning direction of the gate signal line GL in the display device 10a (an example of the first scanning direction of the present invention) is set to the opposite direction from bottom to top. Perform processing. For example, when the scanning direction is set to the opposite direction, the signal processing unit 11a reverses the reading direction when reading the divided image data from the frame memory 12a. The signal processing unit 11a performs the image inversion processing to generate image data Da. Note that the user of the display system 100 can perform an operation to set the scanning direction (forward or reverse) on the setting screen.

For example, the signal processing unit 11a performs processing (enlarge processing) for displaying the divided image a in an enlarged manner (enlarge display) on the divided image data. Specifically, the signal processing unit 11a performs the enlargement process when the user makes a setting to enable the enlargement display function. The signal processing unit 11a performs the enlargement process to generate image data Da. Note that the user of the display system 100 can perform an operation to enable or disable the enlarge display function on the setting screen. The settings of the enlarge display function are reflected on all display devices 10a, 10b, 10c, and 10d. That is, when the user sets the enlarge display function to be enabled, the enlarge display function is enabled on all display devices 10a, 10b, 10c, and 10d, and the user sets the enlarge display function to be disabled. If this is done, the enlarge display function will be disabled in all display devices 10a, 10b, 10c, and 10d. For example, on the setting screen, the user sets the number of display devices 10 arranged in the horizontal direction, the number of display devices 10 arranged in the vertical direction, and the divided images to be displayed on each display device 10.

Note that the signal processing unit 11a may perform the enlargement process on the video signal Dv received from the video output device 200, and then store the video signal Dv in the frame memory 12a.

For example, the signal processing unit 11a performs processing for adjusting the display timing on the generated image data Da. Specifically, the signal processing unit 11a performs processing (delay time setting) of setting a delay time (an example of the first delay time of the present invention) for delaying the timing (display start timing) of outputting the image data Da to the display unit 15a. setting process). Note that the delay time is the time from when the display device 10a receives the video signal Dv until it starts displaying the divided image a. The delay time setting process will be described later.

The signal processing section 11a performs the above-mentioned signal processing (image inversion processing, enlargement processing, etc.) on the divided image data as necessary and transmits the generated image data Da to the drive control section 14a. Further, the signal processing section 11a transmits the delay time setting information (delay time setting information) set by the delay time setting process to the drive control section 14a. Note that the signal processing unit 11a may delay the timing of reading out the divided image data from the frame memory 12a based on the set delay time. In this way, the delay processing based on the set delay time may be performed by the signal processing section 11a, the drive control section 14a, or another processing section (not shown). Good too.

The storage unit 13a stores various setting information. For example, information about the arrangement position ((row, column)=(1, 1)) of the display device 10a with respect to the display surface 110 of the display system 100 is stored in the storage unit 13a. The storage unit 13a also stores setting information set by the user. For example, the storage unit 13a stores scanning direction setting information, enlargement setting information, delay time setting information, and the like. The storage unit 13a also stores programs for executing various processes (for example, delay time setting process).

The drive control section 14a controls the drive of the display section 15a. Specifically, the drive control section 14a outputs the image data Da received from the signal processing section 11a to the plurality of data signal lines DL while scanning the plurality of gate signal lines GL in the scanning direction set by the user. Then, the divided image a is displayed on the display section 15a.

The display section 15a is composed of, for example, a liquid crystal panel. The display unit 15a displays the divided image a according to the image data Da received from the drive control unit 14a in the upper left area (1, 1) of the display surface 110 of the display system 100.

The display device 10b (an example of a first display device of the present invention) includes a signal processing section 11b (an example of a first signal processing section of the present invention), a frame memory 12b, a storage section 13b, a drive control section 14b, and a display section 15b. (an example of the first display section of the present invention). A video signal Dv output from the video output device 200 and transferred from the display device 10a is input to the input terminal Tib of the display device 10b.

The video signal Dv input from the display device 10a to the display device 10b is input to the signal processing section 11b and is transferred to the output terminal Tob of the display device 10b.

The signal processing unit 11b stores the video signal Dv in the frame memory 12b. Specifically, the signal processing unit 11b sequentially transfers the video signal Dv received from the display device 10a to the frame memory 12b. The frame memory 12b stores one frame worth of video signal Dv (input image data).

Further, the signal processing unit 11b performs various signal processing on the input image data. Specifically, the signal processing unit 11b cuts out data (divided image data) corresponding to the divided image b displayed by the display device 10b from the input image data of the frame memory 12b, and adds the following to the divided image data to the divided image data. Each signal processing is performed to generate image data Db.

For example, the signal processing unit 11b performs processing (image reversal processing) on the divided image data for reversing the vertical direction of the divided image b displayed by the display device 10b. Specifically, the signal processing unit 11b performs the image inversion process when the scanning direction of the gate signal line GL in the display device 10b (an example of the first scanning direction of the present invention) is set to the opposite direction. Note that the display device 10b is set to the same scanning direction as the scanning direction of the display device 10a.

For example, when the user makes a setting to enable the enlarge display function, the signal processing unit 11b performs processing (enlarge display) for enlarging and displaying the divided image b (enlarge display) on the divided image data. processing). Note that the signal processing unit 11b may perform the enlargement process on the video signal Dv received from the display device 10a, and then store the video signal Dv in the frame memory 12b.

For example, the signal processing unit 11b performs processing for adjusting the display timing of the generated image data Db. Specifically, the signal processing unit 11b performs processing (delay time setting) of setting a delay time (an example of the first delay time of the present invention) for delaying the timing (display start timing) of outputting the image data Db to the display unit 15b. setting process). Note that the same delay time as the display device 10a is set in the display device 10b. The delay time setting process will be described later.

The signal processing section 11b performs the above-mentioned signal processing (image inversion processing, enlargement processing, etc.) on the divided image data as necessary and transmits the generated image data Db to the drive control section 14b. Further, the signal processing unit 11b transmits the delay time setting information (delay time setting information) set by the delay time setting process to the drive control unit 14b. Note that the signal processing unit 11b may delay the timing of reading out the divided image data from the frame memory 12b based on the set delay time. In this way, the delay processing based on the set delay time may be performed by the signal processing section 11b, the drive control section 14b, or another processing section (not shown). Good too.

The storage unit 13b stores various setting information. For example, information about the arrangement position ((row, column)=(1, 2)) of the display device 10b with respect to the display surface 110 of the display system 100 is stored in the storage unit 13b. The storage unit 13b also stores setting information set by the user. For example, the storage unit 13b stores scanning direction setting information, enlarge setting information, delay time setting information, and the like. The storage unit 13b also stores programs for executing various processes (for example, delay time setting process).

The drive control section 14b controls driving of the display section 15b. Specifically, the drive control section 14b outputs the image data Db received from the signal processing section 11b to the plurality of data signal lines DL while scanning the plurality of gate signal lines GL in the scanning direction set by the user. Then, the divided image b is displayed on the display section 15b.

The display section 15b is composed of, for example, a liquid crystal panel. The display unit 15b displays the divided image b according to the image data Db received from the drive control unit 14b in the upper right area (1, 2) of the display surface 110 of the display system 100.

The display device 10c (an example of a second display device of the present invention) includes a signal processing section 11c (an example of a second signal processing section of the present invention), a frame memory 12c, a storage section 13c, a drive control section 14c, and a display section 15c. (an example of the second display section of the present invention). A video signal Dv output from the video output device 200 and transferred from the display device 10b is input to the input terminal Tic of the display device 10c.

The video signal Dv input from the display device 10b to the display device 10c is input to the signal processing section 11c, and is also transferred to the output terminal Toc of the display device 10c.

The signal processing unit 11c stores the video signal Dv in the frame memory 12c. Specifically, the signal processing unit 11c sequentially transfers the video signal Dv received from the display device 10b to the frame memory 12c. The frame memory 12c stores one frame worth of video signal Dv (input image data).

Further, the signal processing unit 11c performs various signal processing on the input image data. Specifically, the signal processing unit 11c cuts out data (divided image data) corresponding to the divided image c displayed by the display device 10c from the input image data of the frame memory 12c, and adds the following to the divided image data. Each signal processing is performed to generate image data Dc.

For example, the signal processing unit 11c performs processing (image reversal processing) on the divided image data to invert the divided image c displayed by the display device 10c in the vertical direction. Specifically, the signal processing unit 11c performs the image reversal process when the scanning direction of the gate signal line GL in the display device 10c (an example of the second scanning direction of the present invention) is set to the opposite direction. Note that the display device 10c is set to a scanning direction that is different (opposite) from the scanning directions of the display devices 10a and 10b.

For example, when the user makes a setting to enable the enlarge display function, the signal processing unit 11c performs processing (enlarge display) for enlarging and displaying the divided image c (enlarge display) on the divided image data. processing). Note that the signal processing unit 11c may perform the enlargement process on the video signal Dv received from the display device 10b, and then store the video signal Dv in the frame memory 12c.

Further, for example, the signal processing unit 11c performs processing for adjusting the display timing of the generated image data Dc. Specifically, the signal processing unit 11c performs processing (delay time setting) of setting a delay time (an example of the second delay time of the present invention) for delaying the timing (display start timing) of outputting the image data Dc to the display unit 15c. setting process). The delay time setting process will be described later.

The signal processing section 11c performs the above-mentioned signal processing (image inversion processing, enlargement processing, etc.) on the divided image data as necessary and transmits the generated image data Dc to the drive control section 14c. Further, the signal processing unit 11c transmits the delay time setting information (delay time setting information) set by the delay time setting process to the drive control unit 14c. Note that the signal processing unit 11c may delay the timing of reading out the divided image data from the frame memory 12c based on the set delay time. In this way, the delay processing based on the set delay time may be performed by the signal processing section 11c, the drive control section 14c, or another processing section (not shown). Good too.

The storage unit 13c stores various setting information. For example, information about the arrangement position ((row, column)=(2, 2)) of the display device 10c with respect to the display surface 110 of the display system 100 is stored in the storage unit 13c. The storage unit 13c also stores setting information set by the user. For example, the storage unit 13c stores scanning direction setting information, enlargement setting information, delay time setting information, and the like. The storage unit 13c also stores programs for executing various processes (for example, delay time setting process).

The drive control section 14c controls driving of the display section 15c. Specifically, the drive control section 14c outputs the image data Dc received from the signal processing section 11c to the plurality of data signal lines DL while scanning the plurality of gate signal lines GL in the scanning direction set by the user. Then, the divided image c is displayed on the display section 15c.

The display section 15c is composed of, for example, a liquid crystal panel. The display unit 15c displays the divided image c according to the image data Dc received from the drive control unit 14c in the lower right area (2, 2) of the display surface 110 of the display system 100.

The display device 10d (an example of a second display device of the present invention) includes a signal processing section 11d (an example of a second signal processing section of the present invention), a frame memory 12d, a storage section 13d, a drive control section 14d, and a display section 15d. (an example of the second display section of the present invention). A video signal Dv output from the video output device 200 and transferred from the display device 10c is input to the input terminal Tid of the display device 10d.

The video signal Dv input from the display device 10c to the display device 10d is input to the signal processing section 11d.

The signal processing unit 11d stores the video signal Dv in the frame memory 12d. Specifically, the signal processing unit 11d sequentially transfers the video signal Dv received from the display device 10d to the frame memory 12d. The frame memory 12d stores one frame worth of video signal Dv (input image data).

Further, the signal processing unit 11d performs various signal processing on the input image data. Specifically, the signal processing unit 11d cuts out data (divided image data) corresponding to the divided image d displayed by the display device 10d from the input image data of the frame memory 12d, and adds the following to the divided image data. Each signal processing is performed to generate image data Dd.

For example, the signal processing unit 11d performs processing (image reversal processing) on the divided image data to invert the divided image d displayed by the display device 10d in the vertical direction. Specifically, the signal processing unit 11d performs the image inversion process when the scanning direction of the gate signal line GL in the display device 10d (an example of the second scanning direction of the present invention) is set to the opposite direction. Note that the scanning direction of the display device 10d is set to be the same as the scanning direction of the display device 10c.

For example, when the user makes a setting to enable the enlarge display function, the signal processing unit 11d performs processing (enlarge display) for enlarging and displaying the divided image d (enlarge display) on the divided image data. processing). Note that the signal processing unit 11d may perform the enlargement process on the video signal Dv received from the display device 10c, and then store the video signal Dv in the frame memory 12d.

For example, the signal processing unit 11d performs processing for adjusting the display timing of the generated image data Dd. Specifically, the signal processing unit 11d performs processing (delay time setting) of setting a delay time (an example of the second delay time of the present invention) for delaying the timing (display start timing) of outputting the image data Dd to the display unit 15d. setting process). Note that the same delay time as the display device 10c is set for the display device 10d. The delay time setting process will be described later.

The signal processing section 11d performs the above-described signal processing (image inversion processing, enlargement processing, etc.) on the divided image data as necessary and transmits the generated image data Dd to the drive control section 14d. Further, the signal processing section 11d transmits the delay time setting information (delay time setting information) set by the delay time setting process to the drive control section 14d. Note that the signal processing unit 11d may delay the timing of reading out the divided image data from the frame memory 12d based on the set delay time. In this way, the delay processing based on the set delay time may be performed by the signal processing section 11d, the drive control section 14d, or another processing section (not shown). Good too.

The storage unit 13d stores various setting information. For example, information about the arrangement position ((row, column)=(2,1)) of the display device 10d with respect to the display surface 110 of the display system 100 is stored in the storage unit 13d. The storage unit 13d also stores setting information set by the user. For example, the storage unit 13d stores scanning direction setting information, enlargement setting information, delay time setting information, and the like. The storage unit 13d also stores programs for executing various processes (for example, delay time setting process).

The drive control section 14d controls driving of the display section 15d. Specifically, the drive control section 14d outputs the image data Dd received from the signal processing section 11d to the plurality of data signal lines DL while scanning the plurality of gate signal lines GL in the scanning direction set by the user. Then, the divided image d is displayed on the display section 15d.

The display section 15d is composed of, for example, a liquid crystal panel. The display unit 15d displays divided images d according to the image data Dd received from the drive control unit 14d in the lower left area (2, 1) of the display surface 110 of the display system 100.

Note that the display system 100 or each display device 10 may set the scanning direction and delay time of each display device 10 based on the arrangement information of each display device 10, or the user can set the scanning direction and delay time of each display device 10 on the setting screen. The scanning direction and delay time in 10 may be set.

[Delay time setting process]
Hereinafter, an example of the procedure of the delay time setting process executed in each of the display devices 10a, 10b, 10c, and 10d will be described with reference to FIG. 5. Here, on the setting screen, the user sets the scanning direction of the display devices 10a and 10b to the forward direction, sets the scanning direction of the display devices 10c and 10d to the reverse direction, and makes settings to enable the enlarge display function. Assume that you have done so. Note that "S" shown in FIG. 5 indicates a step number of the processing procedure.

First, the display device 10a determines whether the enlarge function is enabled (S101). If the enlarge function is set to be disabled (S101: NO), the process moves to S103. Here, since the enlarge function is set to be valid (S101: YES), the process moves to S102.

In S102, for example, the signal processing unit 11a sets a delay time of {(MN)/M} frames.

Here, “M” in the above formula represents the number (number of rows) of the plurality of display devices 10 arranged in the first direction (here, column direction) in the display system 100. Here, since the two display devices 10a and 10d are arranged side by side in the first direction, "M"=2. Further, the “N” represents the arrangement position (row number) of the display device 10 for which the delay time is to be set in the display system 100. Here, since the display device 10a for which the delay time is to be set is arranged in the first row (first row), the above-mentioned "N"=1.

Accordingly, in S102, the signal processing unit 11a sets a delay time of 1/2 frame.

Next, the display device 10a determines whether the scanning direction is the opposite direction (S103). If the scanning direction is the reverse direction (S103: YES), the process moves to S104, and if the scanning direction is the forward direction (S103: NO), the process moves to S105.

In the display device 10a, since the scanning direction is set to the forward direction (S103: NO), the process moves to S105, and the signal processing unit 11a further delays the delay time for 1 frame in addition to the delay time for 1/2 frame. Set the delay time. Therefore, in the display device 10a, the signal processing unit 11a sets a delay time for a total of 1.5 frames (an example of the first delay time of the present invention). Thereby, the display device 10a starts displaying the divided image a according to the image data Da 1.5 frames after the display device 10a receives the video signal Dv.

The display device 10b performs the same processing as the display device 10a. Thereby, the display device 10b starts displaying the divided image b according to the image data Db 1.5 frames after the video signal Dv is input to the display device 10b.

Since the enlarge function is enabled in the display device 10c (S101: YES), the signal processing unit 11c sets a delay time of {(MN)/M} frames (S102). Here, since the display device 10c is arranged in the second row (second row), the above-mentioned "N"=2. Therefore, in S102, the signal processing unit 11c sets the delay time to "0".

Next, in the display device 10c, since the scanning direction is set to the opposite direction (S103: YES), the signal processing unit 11c performs image reversal processing. Specifically, the signal processing unit 11c reverses the reading direction when reading the divided image data corresponding to the divided image c from the frame memory 12c. Therefore, in the display device 10c, the signal processing unit 11c sets the delay time to "0". Thereby, after the video signal Dv for one frame is input to the display device 10c, the display device 10c performs the image reversal processing without performing the delay processing, and converts the divided image c according to the image data Dc. Start displaying.

The display device 10d performs the same processing as the display device 10c. Thereby, after the video signal Dv is input to the display device 10d, the display device 10d performs the image inversion processing without performing delay processing and starts displaying the divided image d according to the image data Dd. . In this way, the signal processing units 11a and 11b delay the timing at which the display devices 10a and 10b display the divided images a and b to match the timing at which the display devices 10c and 10d display the divided images c and d. Set the time.

[Display processing]
Hereinafter, with reference to FIGS. 6 and 7, an example of an image displayed on the display surface 110 of the display system 100 by the display process executed based on the delay time set by the delay time setting process will be described. . Here, it is assumed that the image corresponding to the video signal Dv is an image in which a vertical line extending in the column direction moves to the right, as shown in FIG. In FIG. 7, for convenience, an image displayed on the display device 10a arranged at (row, column)=(1,1) and an image displayed on the display device 10c arranged at (row, column)=(2,1) are shown. The displayed image is shown.

FIG. 7(a) shows an image displayed on the display system according to the comparative example, and FIG. 7(b) and FIG. 7(c) show images displayed on the display system 100 according to the embodiment of the present invention. show. Further, FIG. 7A shows a case where the scanning directions of the display devices 10a, 10b, 10c, and 10d in the first and second rows are set to the forward direction. Further, FIG. 7B shows a case where the scanning direction of the display devices 10a and 10b in the first row is set to the forward direction, and the scanning direction of the display devices 10c and 10d in the second row is set to the reverse direction. , FIG. 7C shows a case where the scanning directions of the display devices 10a and 10b in the first row are set to the opposite direction, and the scanning directions of the display devices 10c and 10d in the second row are set to the forward direction.

First, an image displayed in a display system according to a comparative example will be described with reference to FIG. 7(a).

When the first frame starts, the display devices 10a and 10d start receiving the video signal Dv, and the display device 10a starts displaying the divided image a of the first frame image (see FIG. 6). When 1/2 frame has elapsed, the display device 10d starts receiving the video signal Dv corresponding to the divided image d of the first frame displayed by the display device 10d among the video signals Dv, and starts displaying the divided image d. Start.

When the second frame starts, the display device 10a starts displaying the divided image a of the second frame image (see FIG. 6). When 1/2 frame has elapsed, the display device 10d starts receiving the video signal Dv corresponding to the divided image d of the second frame displayed by the display device 10d among the video signals Dv, and starts displaying the divided image d. Start.

By performing display processing in this manner, in the display system according to the comparative example, each image (divided image a, divided image a, c) Misalignment (image misalignment) occurs.

Next, images displayed in the display system 100 according to the embodiment of the present invention will be described with reference to FIG. 7(b). Note that in FIGS. 7(b) and 7(c), the processing time and delay time corresponding to the image reversal processing are omitted. Furthermore, the display processing of the display system 100 is included in the display method according to the present invention. Further, the display method according to the present invention includes a signal processing step (a first signal processing step according to the present invention, a second signal processing step according to the present invention) including a step of setting a scanning direction, a step of generating divided images, and a step of setting a delay time. (corresponding to the step) and a display step (corresponding to the first display step and the second display step according to the present invention) for displaying the generated divided images.

When the first frame starts, the display devices 10a and 10d start receiving the video signal Dv, and the display device 10a receives the delay time set in the delay time setting process (see S102 in FIG. 5). /2 frames), the display of the divided image a of the first frame image (see FIG. 6) is started. When 1/2 frame has elapsed since the display device 10d started receiving the video signal Dv, the display device 10d starts receiving the video signal Dv corresponding to the divided image d of the first frame displayed by the display device 10d out of the video signal Dv. and starts displaying the divided image d.

Even when the scanning direction of the display devices 10a and 10d is set to the scanning direction shown in FIG. 7(c), the display process is similar to that shown in FIG. 7(b). When the first frame starts, the display devices 10a and 10d start receiving the video signal Dv, and the display device 10a receives the delay time (1/2 frame) set in the delay time setting process (see S102 in FIG. 5). minutes), the display of the divided image a of the first frame image (see FIG. 6) is started. When 1/2 frame has elapsed since the display device 10d started receiving the video signal Dv, the display device 10d starts receiving the video signal Dv corresponding to the divided image d of the first frame displayed by the display device 10d out of the video signal Dv. and starts displaying the divided image d.

FIG. 8 is a diagram schematically showing the flow of processing until an image is displayed on the display surface 110 of the display system 100. Here, a case will be exemplified in which three display devices 10a, 10b, and 10c are arranged in the first direction (column direction). The display device 10a displays the upper divided image a of the first frame F1 corresponding to the video signal Dv, the display device 10b displays the middle divided image b of the image, and the display device 10c displays the upper divided image a of the first frame F1 corresponding to the video signal Dv. , displays the lower divided image c of the images. The display devices 10a, 10b, 10c execute enlarge processing to enlarge the divided images a, b, c to a size corresponding to the display devices 10a, 10b, 10c. Furthermore, here, since the scanning directions of the display devices 10a and 10c are set to opposite directions, the display devices 10a and 10c perform image reversal processing.

In the example shown in FIG. 8, the display device 10a sets a delay time of {(3-1)/3}=2/3 frames, and the display device 10b sets a delay time of {(2-1)/3}= A delay time is set for (1+1/3) frames, which is the sum of 1/3 frame and 1 frame associated with image inversion processing, and the display device 10c sets the delay time to "0". The display devices 10a, 10b, and 10c start displaying the divided images a, b, and c at timings corresponding to the delay time, respectively.

According to the display system 100 according to the embodiment of the present invention, there is a gap ( (image misalignment) can be eliminated. Furthermore, since the video output device 200 is configured to output the video signal Dv corresponding to one frame of image without generating images (divided images) according to each display device 10, the amount of frame memory used is reduced. It never increases. Therefore, it is possible to prevent image misalignment between display devices with a simple circuit configuration while suppressing the amount of frame memory used. Note that when performing image reversal processing, the display system 100 delays the display start timing of an image on the display device 10 whose scanning direction is set to the forward direction by one frame (see S105 in FIG. 5).

FIG. 9 is a timing chart showing the display timing in each of the display devices 10a, 10b, 10c, and 10d. In the above example, as shown in FIG. 9, the display devices 10a and 10b each start displaying divided images a and b according to the image data Da 1.5 frames after receiving the video signal Dv. do. Furthermore, when 1/2 frame has elapsed since the display devices 10c and 10d started receiving the video signal Dv, the display devices 10c and 10d each display a divided image c of the first frame of the video signal Dv that is displayed by the display devices 10c and 10d, It starts receiving the video signal Dv corresponding to d, then performs image inversion processing, and then starts displaying the divided images c and d.

As described above, in the delay time setting process, the delay time setting process is based on the number of display devices 10 arranged in the first direction (number of rows) and the arrangement position (row number) of the display device 10 for which the delay time is to be set. Then, the delay time is set. For example, when three display devices 10 are arranged in the first direction, a delay time of {(3-1)/3}=2/3 frames is set for the display devices 10 in the first row. Further, in the display device 10 in the second row, a delay time of {(2-1)/3}=1/3 frame is set. Similarly, for example, if four display devices 10 are arranged in the first direction, the delay time for the display devices 10 in the first row is set to {(4-1)/4}=3/4 frames. In the display device 10 in the second row, a delay time of {(4-2)/4}=2/4 frame is set, and in the display device 10 in the third row, the delay time is set as {(4-3)/4}. }=A delay time of 1/4 frame is set.

The display system 100 according to the present invention is not limited to the above configuration. For example, the display system 100 may omit enlarge processing (image enlargement processing), and each display device 10 may display a part of the image (divided image) at the same size without enlarging it. In this configuration, in step S101 shown in FIG. 5, it is determined whether the video signal Dv input from the video output device 200 is a divided image, and if it is not a divided image (that is, if it is a frame image), The process of setting the delay time may be performed in step S102.

Furthermore, in the display system 100 described above, the plurality of display devices 10 are connected in a daisy chain, and the video signal Dv output from the video output device 200 is input to the display device 10a. but not limited to. For example, each of the plurality of display devices 10 may be connected to a video output device 200, and the video signal Dv output from the video output device 200 may be input to each display device 10.

Furthermore, in the display system 100, in each display device 10, the gate signal lines GL may be arranged to extend in the column direction, and the data signal lines DL may be arranged to extend in the row direction.

In the display system 100 described above, in each display device 10, the data signal lines DL are arranged to extend in the column direction (vertically), and the gate signal lines GL are arranged to extend in the row direction (horizontally). In addition, it is configured in a so-called horizontal type. As another embodiment, in the display system 100, in each display device 10, the data signal lines DL are arranged to extend in the row direction (horizontal), and the gate signal lines GL are arranged to extend in the column direction (vertical). It may be configured in a so-called vertical type. In a vertical configuration, for example, when the display device 10d (an example of the second display device of the present invention) is arranged to the right of the display device 10a (an example of the first display device of the present invention), the display device The scanning direction of the gate signal line GL in the display device 10a (an example of the first scanning direction of the present invention) is set from right to left, and the scanning direction of the gate signal line GL in the display device 10d (an example of the second scanning direction of the present invention) is set from right to left. (for example) is set in the direction from left to right (see FIG. 10), the signal processing unit 11a performs an image reversal process of reversing the left-right direction of the divided image a. On the other hand, when the scanning direction of the gate signal line GL in the display device 10a is set to go from left to right, and the scanning direction of the gate signal line GL in the display device 10d is set to go from right to left (Fig. 11), the signal processing unit 11d performs image inversion processing to invert the divided image d in the horizontal direction.

10: Display devices 10a to 10d: Display devices 11a to 11d: Signal processing units 12a to 12d: Frame memories 13a to 13d: Storage units 14a to 14d: Drive control units 15a to 15d: Display unit 100: Display system 110: Display surface 200: Video output devices Da to Dd: Image data Dv: Video signals a to d: Divided images

Claims (10)

A display system in which a video signal corresponding to one frame is input to each of a plurality of display devices, and each of the plurality of display devices displays an image, thereby displaying the one frame image corresponding to the video signal. There it is,
The plurality of display devices include M display devices arranged side by side in a first direction in which the data signal line extends,
Of the M display devices arranged in line in the first direction, the first display device arranged Nth (where N=1 to M) in the first direction is:
A first divided image that is a part of the image based on a video signal of a first transmission period from {(N-1)/M} frame to {N/M} frame of the video signal corresponding to the one frame. a first signal processing unit that generates
a first display unit that displays the first divided image generated by the first signal processing unit;
a determining unit that determines whether the scanning direction of the gate signal line arranged in the first display device is a forward direction or a reverse direction;
Equipped with
The first signal processing section includes:
When the determination unit determines that the scanning direction is the opposite direction, the first display device executes an image reversal process of reversing the vertical direction of the first divided image displayed by the first display device; setting a delay time from receiving a video signal to starting displaying the first divided image to a time corresponding to {(MN)/M} frames;
When the determination unit determines that the scanning direction is the forward direction, the delay time from when the first display device receives the video signal to when it starts displaying the first divided image is {(M− N)/M} Set the time to the time for one frame plus the time for one frame,
display system. The first signal processing unit is configured to change the scanning direction of the gate signal line arranged in the first display device to a second display device arranged adjacent to the first display device in the first direction. Set in the opposite direction to the scanning direction of the gate signal line to be
The display system according to claim 1. In a case where a second display device is arranged adjacently below the first display device,
The second display device displays a second divided image that is a part of the image generated based on a video signal of a second transmission period subsequent to the first transmission period among the video signals corresponding to the one frame. and a second display unit that displays the second divided image generated by the second signal processing unit,
The first signal processing unit sets a scanning direction of a gate signal line arranged in the first display device to a first scanning direction,
The second signal processing unit sets a scanning direction of a gate signal line arranged in the second display device to a second scanning direction opposite to the first scanning direction.
The display system according to claim 1 or claim 2. The first signal processing unit sets the delay time so that the timing at which the first display device displays the first divided image matches the timing at which the second display device displays the second divided image. do,
The display system according to claim 3. When the first scanning direction is set in a direction from bottom to top and the second scanning direction is set in a direction from top to bottom, the first signal processing unit further controls the first divided image. While performing image reversal processing to reverse the vertical direction of
When the first scanning direction is set in a direction from top to bottom and the second scanning direction is set in a direction from bottom to top, the second signal processing unit further controls the second divided image. Perform image reversal processing to reverse the vertical direction of
The display system according to claim 3 or 4. In a case where the second display device is arranged adjacent to the right of the first display device,
When the first scanning direction is set from right to left and the second scanning direction is set from left to right, the first signal processing unit further comprises: While performing image reversal processing to reverse the horizontal direction of
When the first scanning direction is set from left to right and the second scanning direction is set from right to left, the second signal processing unit further controls the second divided image. Perform image reversal processing to reverse the horizontal direction of
The display system according to claim 3 or 4. When the first signal processing section performs the image inversion processing, the second signal processing section sets a delay time for one frame, and
When the second signal processing section performs the image inversion processing, the first signal processing section sets a delay time for one frame.
The display system according to claim 5 or claim 6. The first signal processing unit performs processing for enlarging and displaying the first divided image, and the second signal processing unit performs processing for enlarging and displaying the second divided image.
The display system according to any one of claims 3 to 7. further comprising a video output device that outputs the video signal,
The plurality of display devices are connected in a daisy chain in a loop so that the video signal is transmitted from upstream to downstream.
The display system according to any one of claims 1 to 8. A display method in which a video signal corresponding to one frame is input to each of a plurality of display devices, and each of the plurality of display devices displays an image, thereby displaying the one frame image corresponding to the video signal. There it is,
The plurality of display devices include M display devices arranged side by side in a first direction in which the data signal line extends,
Of the M display devices arranged in line in the first direction, the first display device arranged Nth (where N=1 to M) in the first direction is:
A first divided image that is a part of the image based on a video signal of a first transmission period from {(N-1)/M} frame to {N/M} frame of the video signal corresponding to the one frame. a first signal processing step for generating;
a first display step of displaying the first divided image generated in the first signal processing step;
a determining step of determining whether the scanning direction of the gate signal line arranged in the first display device is a forward direction or a reverse direction;
Run
In the first signal processing step,
When it is determined in the determination step that the scanning direction is the opposite direction, an image reversal process is performed for reversing the vertical direction of the first divided image displayed by the first display device, and the first display device setting a delay time from receiving a video signal to starting displaying the first divided image to a time corresponding to {(MN)/M} frames;
When the scanning direction is determined to be the forward direction in the determining step, the delay time from when the first display device receives the video signal to when it starts displaying the first divided image is defined as {(M− N)/M} Set the time to the time for one frame plus the time for one frame,
Display method.